Can anyone help?! I have 2 platys and one of them always stays at the top of the tank! The other platy seems to every now and again go up to the platy and nuge it. I don't know whether its a he or a she, if its a she, could she be pregnant? Every now and again it will swim elsewhere, but mostly stays at the top. I also have 2 danios, and they are acting normal, as well as the other platy. This is a new habit, only been happening for a few days. The tank is still uncycled, but doing regular water changes. Had the 14L tank over a month now, will be moving them to a larger 35L in a few weeks after xmas, and once the new tank has finished doing a fishless cycle. Thanks in advance!